Rideshare has been popular for decades in the US and Europe. One of the representative areas is southern California, where rideshare is about 15% of the total trips. This study examines the rideshare program in southern California and finds its key to success, the GREEN Rideshare. Considering transportation environments in Taiwan, the SAFER Rideshare is proposed, including Security enhancement for rideshare participants, Affordable commute cost, Fast HOV lanes, Easy rideshare match and park-N-ride, Reliable ride home service in an emergency. Finally, it is suggested that transportation authorities reposition the role of rideshare in the transportation system so that it could become a perfect complement to transit and private modes.